tools/testing/selftests/net/reuseaddr_conflict.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/reuseaddr_conflict.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/reuseaddr_conflict.c
Extension
.c
Size
2690 bytes
Lines
115
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

sizeof(v6only)) < 0) {
		perror("setsockopt IPV6_V6ONLY");
		goto out;
	}

	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
		       sizeof(reuseaddr)) < 0) {
		perror("setsockopt SO_REUSEADDR");
		goto out;
	}

	if (bind(fd, addr, addrlen) < 0) {
		perror("bind");
		goto out;
	}

	if (any)
		return fd;

	if (listen(fd, 1) < 0) {
		perror("listen");
		goto out;
	}
	return fd;
out:
	close(fd);
	return ret;
}

int main(void)
{
	int listenfd;
	int fd1, fd2;

	fprintf(stderr, "Opening 127.0.0.1:%d\n", PORT);
	listenfd = open_port(0, 0);
	if (listenfd < 0)
		error(1, errno, "Couldn't open listen socket");
	fprintf(stderr, "Opening INADDR_ANY:%d\n", PORT);
	fd1 = open_port(0, 1);
	if (fd1 >= 0)
		error(1, 0, "Was allowed to create an ipv4 reuseport on a already bound non-reuseport socket");
	fprintf(stderr, "Opening in6addr_any:%d\n", PORT);
	fd1 = open_port(1, 1);
	if (fd1 < 0)
		error(1, errno, "Couldn't open ipv6 reuseport");
	fprintf(stderr, "Opening INADDR_ANY:%d\n", PORT);
	fd2 = open_port(0, 1);
	if (fd2 >= 0)
		error(1, 0, "Was allowed to create an ipv4 reuseport on a already bound non-reuseport socket");
	close(fd1);
	fprintf(stderr, "Opening INADDR_ANY:%d after closing ipv6 socket\n", PORT);
	fd1 = open_port(0, 1);
	if (fd1 >= 0)
		error(1, 0, "Was allowed to create an ipv4 reuseport on an already bound non-reuseport socket with no ipv6");
	fprintf(stderr, "Success\n");
	return 0;
}

Annotation

Implementation Notes